Telephone system



May 1, 1923. 1,453,821 G. A. YANOCHOWSKI TELEPHONE SYSTEM Filed June 20. 1921 Patented May 1, 1923.

UNHTE'D STATES GEORGE A. YANOCHOWSKI, or CHICAGO, rnnrnors assrenon T0 KELLOGG swrronoann AND SUPPLY COMPANY, or CHICAGO, ILLINOIS, A conroaa'rron or ILLI- c NOIS.

v TELEPHONE sYs'rnM.

Application filed June 20, laai iseriariib. 478,795 t To all whom it may concern: v it Be it known that I, GEORGE A. YANooHow- SKI, a citizen of the United States of America, and a resident of Chicago, county of Cook, and State of Illinois, have invented certain new and useful Improvements: in Telephone Systems, of which the following is a specification. 7 1 My invention relates to telephone systems, and has to do more particularly with automatic ringing systems such as are provided for operators cord circuits in which an interrupter relay is intermittently energized and de-energized to intermittently apply ringing current to the called line.

In systems of the, above character the ringing current when applied to a called line may be interrupted by a control exercised by the called substation in answering a call, and a feature of my invention is the provision of a control exercised by the calling substation, should he replace his receiver prior to receiving response from the called substation to introduce a resistance of rather high impedance in the ringing circuit to reduce the amount of flow of ring thus preventing operative actuation of the called subscribers call bell, thereby pre venting the ringing of the called subscribers call bell. f v V In the accompanying drawing I have illustrated a-preferred embodiment of my invention, and the systemas shown includes a calling substation A terminating in a line circuit Lhaving the usual line relay LR,

cut-off relay CO; line jacks J and multipleline lamps S. To the right of the drawing c I illustrate a called substation B terminating in the line circuit L having the usual line relay LR, cut-off relay C0 of the line jacks J, and the multiple line lamps SC The line circuits L and L'shown areawhat are known as multiple line lamp circuits, in which a line lamp S is provided for each jack J so that when'a callvis initiated the called lines, and comprises-an answering the subscriber at the substation to recall if he 7 wishes to do so. ing current over the called subscribers line,

supervisory lamp CL.

plug lA P 'and a calling plug CB connected by the heavily v marked conductors.

prises an answeringltip"supervisory relay AT and, an answering sleeve supervlsory IrelayJiAlS, the said'ans wering sleeve supervisory relay AS when energlzed connects mwWe The.

answering end of thefcord circuit C com v tion A Relays AT'and AS .upon energiz ai tion also prevent, the premature lighting of 1 the answering supervisory lamp A high "resistance test relay TE is also provided which relay TE is for the purpose of 'eX- to seize the call after an operator has'aleluding any other operator that niay attempt ready established connection to the calling line. A. link disconnect relay "LD is also provided which is energized when the subs scriber atv a calling substation replaces his rece ver upon the swltchhook to dlsas'soc ate the cordcircuit connected with his line from" y his asso clated .l1ne circuit, which'wlll permit e 1 The calling endot the cord circuit C com prises a calling tip supervisory -relay CT v said relayslCT and CS being for the usual supervisory purposes to control the calling Telay,R C-is also provided; which relay is energized upon the depression of the ringing key plunger ,of the partvline ringing key A ringing control I BK, and Ithe jsaid relay RC uponleinergziza 'v tion connects constantly rotatin g interrupt'er' I in circuit with a ringing interrupter relay RI to intermittently connect ringingcurrent -.to one of a plurality of ringing'generators G, G1 G orQG? to'inter mittently connectc the call bell at the. substation :B.

'meterfrelayis also provided in associationwith a meter magnet MM for. register- 4 Q DQCtiOns; i o I Having described in generallthe apparatus embodied in the preferred embodiment of myinvention, I will now describemore in detail the operation of. the system "as illustratedwinthe accompanying drawings Assuming that the subscriber at the substation A initiates a call, theremoval of thewreceiver atthe substation "A establishes 7 an energining circuit for? the line relay'fLR of g the line circuit 1 l 4, -andthe line relay LB connection takes place.

energizing closes its alternate contact 2, whereby the line signals S for the diiferent associated jacks J are lighted. The first operator to seize the call by the insertion of an answering plug AP into one of the acks J connects the high resistance test relay TE and cut-off relay CO in series from battery through the winding of the relay TE, cnductor 3, sleeve contact of the connected plug AP and jack J to ground through the winding of the cut-off relay CO. The relay TE is energized over this circuit and the closing of its alternate contact 41 connects the low resistance answering sleeve super visory relay AS in series with the cut-off relay CO, circuit being traced from battery through the winding of the relay AS, conductors and 6, alternate contact 4 of the relay TE, conductor 3 to ground through the winding of the cut-off relay CO, over the previously described path. The closing of alternate contact 7 of the relay AS connects the winding of relay AS directly to the sleeve conductor of the cord circuit 0 indie pendent of the contact 4 of the relay TE, and relay AS remains energized until dis- Due to the flow of current to the windings of the relays AS and TE over the calling line, the answering tip supervisory relay AT is also energized over a circuit traced from ground through the winding of the relay AT tip conductor of cord circuit C, tip contact of the connected plug AP and jack J, through the closed con tacts of the substation switchhook and back through the sleeve contacts of the connected jack J and plug AP, normal contact 9 of the relay LD, conductor 3, alternate contact 7 of relay AS, to battery through the winding of the relay AS. The relay AT energizes over this circuit, and the opening of its normal contact 10 prevents the premature lighting of the answering supervisory lamp AL The closing of alternate contacts 12 and 13 of the answering sleeve supervisory relay AS connects the .operators set 0 in bridge of the talking conductors of the cord circuit C, through conductors 14 and 15, alternate contacts 12 and 13 of the relay AS,

conductors 16 and 17, normal contacts 18 and 19 of the calling sleeve supervisory re- AT and conductors 20 and 21 to the tip and sleeve, conductors of the cord circuit. Should a second operator insert an answering plug AP into another jack J of the calling line subsequent to the insertion of the plug AP 0t thecord circuit Q that is not connected 't-o the calling line, the test relay TE of thesecond cord does not energize due to the shu'ntinglot its winding by thedow resistancerelay AS of the cord circuit Qso that the second operator is not tree to' communicate with the calling s'ub scriber because her operatorsset is not conheated; due 3 to the *failure' of the answering sleeve supervisory relay AS of the second cord to energize, and the second operator receiving no response again withdraws the answering plug AP of the second cord from the connected jack.

The first operator having connected with the calling subscriber at the substation A as just described now inquires the want of the calling subscriber thereat. Assuming that it is the subscriber at the substation B that is wanted, the operator tests the jack J of the calling line in the usual manner, and it busy she will receive the customary busy click in her head set. Assuming that the line is idle, the operator inserts the calling plug CP into the ack J of the called line, thus establishing a series energizing circuit :tor the calling sleeve supervisory relay (S and the cut-off relay Q0 from battery through the winding of the relay CS, sleeve contacts of the connected plug CP and jack J to ground, through the winding. of the cut-off relay CO. The relay CS energizing opens its normal contacts 18 and 19 to dis- 7 connect operators set C from the cord conductors. The opcratornow depresses the proper key plunger ot' the ringing key Bl": whereby the selected generaton which we will assume is is now connected to the common ringingconductor The actuation oi the ringing key plunger to its fully depressed position also momentarily a ctua'tes the end spring contacts 23 and 24. i The closing of alternate contact 23 ot the end spring contacts established an energ zing circuit for the ringing control relay RC traced from battery through the winding 01 the relay RC, conductor 25. alternate contact 23 of the end spring contacts conductors 26 and 27 to ground at alternate contact 28 of the calling sleeve supervisory relay CS. The relay BC energizing closes its alternate contact 29, establishing a locking circuit for itself. traced from battery through its winding. its alternate contact 29. conductor 30. normal contact 31, of the calling tip supervisory relay ("II conductors 32- and 27 to ground at alternate contact 28 ot the relay CS. The relay RC energizing interrupts its normal contacts 33 and 34 to interrupt the tip and sleeve conductors of the cord circuit and the closing of alternate contact 35 ot' the relay RC establishes an energizing circuit for the ringing intei'l'uptcr relay RT. traced from battery through the constantly rotat lugg lHtGIIIlDtQl' l, through the winding oi the interrupter relay Pl. conductor 36, alternate contact 515 of the relay RC, conductor '37, normal contact 23 of the end spring con tracts. conductors 26 and 27' to ground at alternate contact 28 of the relay CS. The momentary closure ot alternate contact 24- of the end spring contacts upon the depression of a plunger of the ringing lrey BK closes an energizing circuit for the meter relay MR, from battery through the ivindi'ng of relay MR, the closed contact 24 of the endspring contacts, conductor 38, normal con tact 29 of the relay RC, conductor 30, normal contact 31 of-the relay CT, conductors 32 and 27 to groundat alternate contact- 28 of the relay CS. 'The'meter relay MR energizing closes its alternate contact to energize the meter magnet MM, which meter magnet MM actuates the meter mechanism toregister a connection. The ringing interrupter relay RI'is intermittently energized and de-energized over the circuit just described and the ringing current at the called substation B iuay be traced from the generator G, through the now closed ringing key plunger contact, ringing conductor 22, normal contacts 39 0f the link disconnect relay LD, conductor 40 alternate contact-'41 of relay RI, conductor 42, alternate contact 43 of therelay CS; the tip contacts of the con nectedplugCP and jack J", through the call bell and condenser of the called substation B and back through the sleeve contact of the connected. jack J and plug GP to battery and ground through alternate contact 44 of relay RI. The call bell at the substation B is thus intermittently actuated and upon the response of the called subscriber at the substation B, and following the de-energization of the relay Bl a circuit is established for the calling tip supervisory relay CT, traced from ground through the winding of the relay CT, normal contact4l of the relay RI, conductor 42, alternate contact 43 of the relay CSftip contact of the connected plug GP and jack J, through the now closed contacts of the substation switchhook back through the sleevevcontacts of the connected jack J and plug GP to battery through the Winding of therelay CS The relay CT energizing opens its normal contact 31, which interrupts the locking circuit of the ringing control. relay RC. and the said re lay now de-energizes and the opening of it alternate contact '35 disconnects the constantly rota-tingv interrupter I fromthe ring.- ing interrupter relay BL thus preventing turther application of ringing current to the called substation B. I

' The'closiug of the normal contacts 33 and 34 ot the noW'de-energized relay RC recstablishes the continuity of the talking conductors; and the calling si'ibscriberat the substation Afand. the called subscriber at the substation B are now in conversational circuit'.{ \vliich may be traced over tlielieaviy marked conductors.

' Assuming now that a connection has been extended to the called substation B, as just described and that the call bell atthe substation is being actuated. but that the calling subscriber at the substation replaces his receiver prior toreceiying a response iroiirthe subscriber at" the called. substation B The replacing of thereceiver at the'calling substation Aby the subscriber the'reat' opens the energizing circuit of the: ansWer-= ing tip supervisory relay AT at the switch hook contacts and the closing of 'itsnormal contact 10, establishes an energizing circuit. for the'link disconnect relay Ll), tracedfrom battery through thewinding of the 're- 'swer ng sleeve supervisory relay AS, but a substitute circuit isestablished for the said relay AS, tracedtrombat-tery through the Winding of the relay AS, its alternate contact 7 conductor 3, alternatecontactt-ot the relay TE, conductor 6, alternate contact 53 of the relay LD, conductors 54 and 51,.

alternate contact 52 of the relay AS, con-' ductors 26 and 27 to ground at, alternate contact 28 of. the relay CS, Theenergiz'ing as it circuit of thefrelay TE is also, interrupted at normal contact 9, but'the'relay TE has a substitute circuit established for it from battery through the winding; of the relay TE, its alternate contact 4, to ground atalternate contact 28 of the relay CS over the I path as just described.

The closing of normal contact 10 of the relay AT also closes a circuit forYthe answering supervisory lamp AL, traced from.

battery through the .winding of the lamp AL. normal contact 10, of the relay AT; conductor 51, alternate contact 52 ofrelay AS,'

conductors26 and27 to groundalterna-te contact 28 of the relay CS. In this' instance the relay BC remains energized as the called subscriber has notansweredand, therefore, the calling tip supervisory relay CT is still at normal and the lockingcircuitof the 're- Y i The link disconnect relay LD energizing" lav R0 is maintained.

opens its normal contact 39, andtheim- 'pedance coil 60, which is normally in" shunt of the normallyclosedgcontact 390i the re lay LD before it has energized, is now pl'aced in circuitjwith'the ringing currcnt 'due to} the opening of normal contact 39 a'nd vthe ringing current through the contact'39 ofthe elay Ll) before't-he subscriber atqthe alling-substaticn A has replacedhis"receiver-now flows through the coil 60 and the ringing circuit which normally; inflows may now betracedfl'from the ungrounderl I pole oftheigenerator conductor '22 to the resistance 60 conductor 40,-alte rnate contact 41 of the'ringing interrupter relay RI" and over the previously describedullflath to batfer y and ground through alternate contact .44 of the relay El; The ringing interrupter relay is intermittently energizetlxa'rirl o energized over a path as previously described. due to the fact that the ringing contr'ol relay RC is maintained energized over its locking circuit due to the itactthat the relay CT is still at normal as the calling subscriber has not as yet removed his receiver from the 'switchhoolt.

The ringingcurrent passing through the impedance coil (30 reduces the current flow to the call bell of the called substation l5 to such an extent as to prevent operative actua tion of the call bell thereat. thereby preventingthe ringing of thecalled snbscribefls hell at the substation l3. The operator havint; received the disconnect signal. from the calling subscriber due to the lighting o the answering supervisory lamp AL, as before described. now withdraws the calling: plnir CP from the jack J oi the led line I) to open the series. energizin c circuit oi the callinnsleeve supervisory relay C9: and the cutoff relay CO ot' the line circuit L. The opening of alternate contact ot' the relay CS opens the locking circuit ot' the ringg' control relay RC and the energizing; i-ircui... of the link disconnect relay Ll) h'ch rcsistance test relay TE and the ilDSWG: supervisory relay AS. The. open withdraws the answering plug, Al 1 an the connected ack J of the calling line and the apparatus used in establishing the connection is now at normal and available tor use in establishingother connections.

It will be observed that when tae subscriber A replaces his receiver upon the switchhook prior to receiving a response from the called substation, the relay LD was energized to open its normal contacts 8 and 9 to disconnect the cord conductors from the calling line. The cut-oil relay CU, therefore, restores so that the subscriber at the substation A is available for immediate recall.

Noun if the subscriber at th substation A desires to initiate a recall iunnediately after replacing his receiver upon the switchhook and before the removal 01"? the plugs APand GP from their respective jacks, the removal of the receiver at the calling substation A again stablishes a circuit "for the line relay LR of the line circuit la, and the line relay LR is energized to light its asso-' ciated .line signals S. so that same or another operator may take the call.

Then a connection has been established between two subscribers at the substations A and B in the manner as before described and both receivers are oil: their switchhoolrs. the conversational circuit may be traced over the heavily marked conductors.

At the termination of conversation the re placing of the receiver at the substation opens the energizing circuit of the answering tip supervisory relay AT, and the rel AT now restores to close its normal contact The closing of normal contact 10 of the relay AT estabhshes an energizing C11- cuit for-the link disconnect relay LD over alternat contact 53 or" the relay Ll). The

The closing of normal contact 10 of the relay also establishes an energizing circuit for the answering supervisory lamp AL irom battery through the lamp AL, normal contact 10 conductor 5L alternate contact of the relay AS, to ground at alternate contact 28 of the: relay CS. The said answerinn; supervisory lamp AL thus lights over this circuit.

The re ilacingg of the receiver at the called substation P; opens the energizing circuit oi the calling tip supervisory relay CT at the switchhook contacts, and the relay CT deenergizinn' closes its normal contact 31., establishing an energizing circuit for the calling supervisory lamp CL. traced from battery through the lamp CL, normal contact 29, conductor 30, normal contact 31 of the relay CT, conductors 32 and 27 to ground at alternate contact 28 of the relay CS.

The operator noting the two lighted signals AL and CL now withdraws the answer plugs AP and Cl from their respective pcls J and J. The withdrawal of the GP from the jack J opens the enercircuitfor the, relay CS, and the relay CS restoringopens the energizing circuits oi the relays RD TE and is. The removal of the plug); Al from the jack J now places the apparatus that was used in establishing the connection at normal. which may now be used for establishing other connections.

While. I have illustrated and described my invention in connection with a preferred. form of cord circuit. it is to be understood. that it is applicable for use with other circuits than that shown. It will also be apparent that changes and. modifications will readily suggest themselves to those skilled in the art. and I, therefore, do not wish to be limited to the exact structure shown, but 3 i to cover all such changes and modifications come within the spirit and scope of the appended claims.

What I claim as new and desire to secure by United States Letters Patent, is:

1. telephonesystem including a calling said relay AS due to. the closure of l subscribers line and a called subscribers line,

an operators link circuit for usein inter connecting said lines, a source of ringing current, operator controlled means for connecting said ringing current-to the said called subscribers line, arelay controlled over the calling line, and means including a link disconnect relay controlled by said relay for cutting down the fiow oi ringing currentto the calledsubscribefis line by di-- recting the ringing current through a high resistance circuit which is normally shunted prior to the operation of said disconnect relay.

2. A telephone system including a calling subscribers line and a called subscribers line, an operators link circuit for connecting said lines, a source ofiringing current,

means for intermittently applying said ringing current to the called subscribers line,

and means including a link disconnect relay controlled by the replacement ot the receiver atthe calling substation to introduce impedance means in the ringing circuit to cut down the current fiow to prevent further operative actuation of the call bell at the called substation, said impedance being nor-' mally shunted by a circuit including a normally closed contact of said disconnect relay through which ringing current normally 3. A telephone system including a calling subscribers line and a called subscribers line, an operators link circuit for interconnecting said lines, a source of ringing current and operator-controlled means for connecting said ringing current to the said,

called subscribers line, a supervisory relay controlled over the calling line, a disconnect relay under the control of said supervisory relay, means controlled by the said supervisory relay by the replacement of the receiver at the calling substation to energize line, an'operators link circuit for interconnecting said lines, a source of ringing current, interrupter means for intermittently applying ringing current to the called line,

and operator controlled means forinitiating the applying of said ringing current, a supervisory relay controlled by the calling subscriber and a disconnect relay controlled by said supervisory relay, means under the control of said supervisory relay by the replacement of the receiver at the calling substation to ener 'ze said disconnect relay to, introduce impe ance means normally shunted by normally closed contacts of said, dis' connect relay to cut down the flow of ringing current to prevent furtheroperative ac t-ua tion of the call bell at the called substav called subtion prior to the response of said station. 1 l

5. A telephone system including, a'calling I I subscribers line" and a called-'subscribers line, an operators link circuit for interconnecting said llnes, a source ofr-mging cure rent, and operator-controlled means for ap plying said source of ringing current, a

supervisory relay controlled over thecalling line, a: disconnect relay controlled by said supervisory relay, an impedance normally bridged across contacts of said relav through which said ringing current passes L-O permit the full value of ringing current to fiow through the call bell at said called substa tion, and supervisory relay controlled means for energizing said disconnect relay to remove said shunt from about said impedance prior to the response of the called substation.

6. A telephone system comprising'tele-' phone lines, an operators link circuit for interconnecting said lines, a source ofring ing current and operator-controlled means for applying said ringing current to a called A line, means controlled at the substation of", the calling line for disassociating his line from the'said l nk circuit, and means responsiveto such disassociation for introducing impedance means in the ringing current to cut down the current flow of the same,-

thereby preventing the operative actuation of the called subscribers call bell,'said im-Y pedance. means normally shunted during" the ringing period when said second last,

means is'in its normal position to permit the full value of'ringing current to flow through said call bell.

7. A telephone system comprising 'tele- 7 phone lines, an operatorslink circuitfor interconnecting said lines, a source of ringin current and. operator-controlled"means for applying said ringing curren't'to a called line means in said link circuit controllable at thesubstation of thecalling line for dis;

associating his line from the connected link circuit, and means including a normally closed contact of said second means ,respo-m sive to the disassociation of said line from ringing circuit to cut down :the amount of current flowing thereover, thereby preventing the operative actuation of said called subscribcrs bell when said calling line and 7 said link to connect impedance means in the d link circuit are disassociated by the opera-.2

tion of said second means prior to the re-'- e 1 p ,sponse of said called subscriber. v

Signed by 'meatChicago, in the county of Cook and State of Illinois, this 17 day of I June, 1921.

f enonenfa. "YANo'cnoWsKif 

